CN110537340A - Particularly for the sending device and method of poor throughput network - Google Patents

Abstract

A kind of sending device, particularly for poor throughput network, comprising: FEC encoder is configured as payload data being encoded to the FEC code word for being respectively provided with predetermined code word length；And frame forming portion, it is configured to form the frame with predetermined frame length.Frame includes the first frame part with the first predetermined length of integral multiple of predetermined code word length, and the second frame part of the second predetermined length with shorter than predetermined code word length.Frame forming portion is configured as covering the repetition of the predetermined quantity of FEC code word and FEC code word in the first frame part of frame, and the position of the selected quantity of FEC code word is covered in second frame part of frame.

Description

Particularly for the sending device and method of poor throughput network

Technical field

This disclosure relates to a kind of sending device and corresponding sending method, particularly for low the gulping down of Internet of Things (IoT) application The amount of spitting network (LTN) is used for similar network.Present disclosure also relates to reception devices and corresponding method of reseptance, particularly for LTN.

Background technique

The of the IoT network for being exclusively used in poor throughput communication has recently been launched in the etsi standard group for being dedicated to LTN technology One specification (including the GS LTN 001 comprising use case, the GS LTN 002 of representation function framework and definition agreement and connects The GS LTN 003 of mouth).LTN technology is the one-way or bi-directional wireless network of a kind of wide area compared with existing network with key difference Network.It realize remote data send it is (distance of about 40km in open place) and/or logical with embedded underground equipment Letter, and with the operation of the smallest power consumption, the several years can also be run even if using normal cell.The technology also achieves advanced letter Number processing, provide the effective protection for interference.

Therefore, LTN is limited especially suitable for data volume and not to be strongly required the poor throughput Machine To Machine of low latency logical Letter.(such as, air is applied using including long-range measurement, the intelligent metering to water, gas or electric power distribution, positioning or intelligent city Pollution monitoring or public illumination).LTN can also be cooperated with cellular network to solve to need making for redundancy, supplement or substitution connection Use case.

LTN IoT network has the topological structure similar with the existing network for high data rate, and with identical Mode dynamically adapting power and frequency, but also newly want the management power consumption and base station number required about the entire country of covering It asks.Low-power, low-down handling capacity, long battery life, simple, effective and steady radio communication principle are the first ETSI The key feature of LTN specification.

To define effective transport stream and its construction used in LTN there are demands.

" background technique " provided herein description is the context in order to which the disclosure is generally presented.In present context part Described in (multiple) inventor signed at present in range work and the prior art may not met when submitting The aspect of description not by clearly or tacit declaration be received to the prior art of the disclosure.

Summary of the invention

The object of the present invention is to provide a kind of sending devices and corresponding sending method, particularly for LTN for constructing Effective transport stream.It is a further object to provide a kind of corresponding reception device and corresponding method of reseptances, especially For LTN and a kind of for realizing the correspondence computer program of the method and for realizing the non-transitory of the method Computer readable recording medium.

According on one side, a kind of sending device is provided, particularly for LTN, comprising:

FEC encoder is configured as payload data being encoded to the FEC generation for being respectively provided with predetermined code word length Code word, and

Frame forming portion is configured to form the frame with predetermined frame length, wherein frame includes having predetermined code word length The first frame part of first predetermined length of the integral multiple of degree, and the second predetermined length with shorter than predetermined code word length The second frame part, wherein the frame forming portion is configured as the predetermined quantity of FEC code word and the FEC code word Repetition covers in the first frame part of frame, and the position of the selected quantity of the FEC code word is covered the of the frame In two frame parts.

According on the other hand, a kind of reception device is provided, particularly for LTN, comprising:

Frame extraction unit is configured as extracting one or more frames from received transport stream, and frame includes being encoded to have respectively There is the payload data of the FEC code word of predetermined code word length, and frame has predetermined frame length, wherein frame includes tool There is the first frame part of the first predetermined length of the integral multiple of predetermined code word length, and there is shorter than predetermined code word length The second predetermined length the second frame part, wherein the frame extraction unit is configured as extracting FEC from the first frame part of frame The repetition of the predetermined quantity of code word and the FEC code word, and the FEC generation is extracted from the second frame part of the frame The position of the selected quantity of code word, and

Fec decoder device, be configured as the FEC code word extracted from the frame, the repetition of the FEC code word and The position decoding payload data of the selected quantity of the FEC code word.

According on the other hand, a kind of computer program including program means is provided, which is used to work as The step of making computer execute the methods disclosed herein when executing the computer program on computer, and it is a kind of non-temporary When property computer readable recording medium, wherein being stored with computer program product, which holds by processor The methods disclosed herein is allowed to carry out when row.

Embodiment is limited in the dependent claims.It should be appreciated that disclosed method, disclosed computer program Have with disclosed computer readable recording medium with claimed device and as limited in dependent claims and/or originally Similar and/or identical other embodiments disclosed in text.

An aspect of this disclosure is to propose that a kind of valid frame for LTN constructs, can be especially real by frame building The decoding that now improves and the bit error rate can be improved.Frame can be made of several repetitions of FEC code word, further include code word A part.Propose the optimal selection read again for this part.

Aforementioned paragraphs are provided in such a way that generality is introduced, it is not intended that limitation scope of the appended claims. In conjunction with the accompanying drawings, reference is described in detail below, and the embodiment and further advantage will be best understood.

Detailed description of the invention

It will be easy to get the more complete understanding to the disclosure and its many adjoint advantages, while working as and being considered in conjunction with the accompanying When will be become better understood by reference to described in detail below its, in which:

Fig. 1 is the diagram for showing the example that same packets are repeatedly sent in new traffic method.

Fig. 2 is to show to receive the diagram of the example of grouping in receiving side in new traffic method.

Fig. 3 is the diagram for showing the example of frequency hopping.

Fig. 4 is the diagram for showing the example for the radio system that may be interfered.

Fig. 5 is the diagram for showing the example interfered when carrying out frequency hopping in radio systems.

Fig. 6 is showing for the configuration example for the position informing system of embodiment for being shown as the wireless system using this technology Figure.

Fig. 7 is the block diagram for showing the configuration example of sending device 101.

Fig. 8 is the block diagram for showing the configuration example of reception device 112.

Fig. 9 is the diagram for showing the example of data of the first format handled by sending device 101.

Figure 10 is the diagram for showing the example of data of the second format handled by sending device 101.

Figure 11 is the block diagram for showing the configuration example of key stream generation unit 211.

Figure 12 shows the first embodiment of frame.

Figure 13 shows the second embodiment of frame.

If the different piece that Figure 14 shows the code word in the second frame part for making frame as shown in Figure 12 is duplicate Dry embodiment.

If the different piece that Figure 15 shows the code word in the second frame part for making frame as shown in Figure 13 is duplicate Dry embodiment.

Specific embodiment

Firstly, by description using the general introduction of the LPWA (low-power wide area) of this technology new traffic method communicated.LPWA is logical Letter is that use can be with low-power consumption tens so as to send a small amount of information (such as, sensor information) in such as IoT equipment The wireless communication of information is sent in the wide scope of 100 kms.In new traffic method, for example, wireless signal is unlicensed 868 or 920MHz frequency band in send.In such a case, it is possible to say that new communication system is one of 920MHz frequency band nothing Line communication.

In Japan, 920MHz frequency band is the frequency range issued by interior communication unit of having stable political situation in July, 2011, and anyone may be used To use it in the case where no licensing.However, about the wireless communication in 920MHz frequency band, maximum continuously transmits the time (radio industry and commercial guild, ARIB, (STD T-108)) is prescribed to be limited to 4 seconds.In addition, if continuously transmitting the time It shortens to such as 0.4 second or shorter, then can reduce the interference effect to the other systems for using similar frequency bands.Therefore, In , it is specified that being set as 0.4 second by the way that the time will be continuously transmitted or shorter distributing more channels in the ARIB rule of 920MHz frequency band. As a result, can be sent and received if being set as 0.4 second or shorter with less interference.If continuously transmitted Time further shortens to 0.2 second or shorter, then can shorten time out and can be retransmitted.In new traffic method In, for example, identical grouping is repeatedly sent, signal is received in the S/N ratio (signal-to-noise ratio, SNR) of receiving side to improve.

Fig. 1 is the diagram for showing the example that same packets are repeatedly sent in new traffic method.

In Fig. 1, the superframe (Superframe) of setting 1 minute, during this period, identical grouping are sent ten times. In new traffic method, sending side executes carrier sense (carrier sensing) when sending.It is right in new traffic method In carrier sense, for example, as shown in fig. 1, one minute superframe is arranged for ten groupings and sends.

Fig. 2 is to show to receive the diagram of the example of grouping in receiving side in new traffic method.

Receiving side receives up to ten groupings from sending side and synthesizes these (ten) groupings, as shown in Figure 2, thus raw At combination signal (if signal quality is not good enough, receiver may only find to be less than ten groupings from transmission signal).So Afterwards, receiving side extracts data from composite signal, and is output it by executing decoding (error correction) etc. to composite signal.With This mode, by the way that these grouping synthesis to generate combination signal, can be improved S/N ratio.For example, (being closed if can be added At) 10 groupings, then about 10dB can be improved in S/N ratio.

Therefore, in new traffic method, even if the S/N ratio of a grouping is low, receiving side also available data, from And it is able to carry out the information transmission of longer distance.In addition, in new traffic method, by the way that grouping transmission time is set as described above It is set to 0.2 second or shorter or 0.4 second or shorter, more frequency channels can be used without being limited by ARIB rule.It utilizes New traffic method, for example, may be used the frequency hopping of multiple carrier frequencies.

Fig. 3 is the diagram for showing the example of frequency hopping.In the frequency hopping of Fig. 3, prepare five channel CH 1 to CH 5, and Each grouping is selected by sending one of this five channels.As channel selecting method, it can be used and sequentially increased according to transmission It sends the method for channel quantity, determine that the method for sending channel quantity, random selection send channel according to predetermined mathematical expression formula The method etc. of quantity.According to this frequency hopping, it is possible to reduce the generation of interference.

Fig. 4 is the diagram for showing the example for the radio system that may be interfered.The radio system of Fig. 4 has multiple Transmitter (transmitter A to transmitter C) and receiver.In the wireless system of Fig. 4, multiple transmitters are sometimes simultaneously with identical Carrier frequency sends radio signal.When multiple transmitters send radio signal simultaneously with identical carrier frequency, connecing It receives and is interfered in device, and become difficult to that the radio signal from each of multiple transmitters is correctly received.

Therefore, the frequency hopping of Fig. 3 is applied to the radio system of Fig. 4.In such a case, it is possible to reduce carrier frequency change A possibility that identical is obtained, and can accordingly inhibit the generation of interference.However, since the wireless system of Fig. 4 is one-way communication, Even if carrying out frequency hopping, the carrier frequency of multiple transmitters may also be identical, does not generate interference completely to be difficult to.

Fig. 5 is the diagram for showing the example interfered when carrying out frequency hopping in radio systems.In Fig. 5, in transmitter A With frequency hopping is carried out in B.However, simultaneously, in some grouping sent from transmitter A and some the grouping tool sent from transmitter B When having identical carrier frequency, the radio signal (grouping) of transmitter A and B are conflicted with each other.In this way, in case of nothing The conflict of line signal, then receiver can not separate the grouping from different transmitters, and it is possible in the number finally obtained According to middle generation mistake.

For example, in fig. 5, it is assumed that receiver is receiving the radio signal from transmitter A.Then, from transmitter A One in the grouping of transmission grouping and the packet collisions sent from transmitter B, and from the wireless signal that transmitter B is sent from Transmitter A transmitting.Assuming that it is more stronger than radio signal.In this case, receiver is by the conflict packet assembling of transmitter B For the grouping from transmitter A.Therefore, it is possible to which mistake occurs in composite signal and data cannot be extracted.In this feelings Under condition, the sending and receiving for 10 groupings in superframe is possible to all be wasted.

In two-way communication, can for example by exchanged between each transmitter A and B and receiver necessary information come Prompt retransmits.However, in one-way communication, it is difficult to which, from side is received to sending side information provision, therefore, it is difficult to take to pass through The countermeasure for the reply packet collisions that two-way communication carries out.

Fig. 6 is showing for the configuration example for the position informing system of embodiment for being shown as the wireless system using this technology Figure.The position informing system 100 of Fig. 6 includes sending device 101 (101-1 to 101-3), base station 102 (102-1 and 102-2), cloud Server 103 and the information processing terminal 104.In position informing system 100, by sending device 101 by new traffic method with Base station 102 carries out radio communication to provide the position monitoring service of the position for monitoring sending device 101.

Sending device 101 is the embodiment for applying the sending device of this technology, and sends and indicate its own position Location information is as radio signal.Base station 102 has reception device 112.Reception device 112 is filled using the reception of this technology The embodiment set receives radio signal from sending device 101, obtains the location information of sending device 101, and will Location information etc. is sent to Cloud Server 103.Therefore, with reception device 112 base station 102 be used as relay station, relaying from The information of the transmission of sending device 101 simultaneously sends it to Cloud Server 103.Cloud Server 103 manages such as each sending device 101 Location information various information, and provide for example for informing the user the service of the position of sending device 101.For example, By wishing to know that the information processing terminal 104 of the user's operation of the position of sending device 101 accesses Cloud Server 103, hair is obtained It display together by the location information for sending device 101 with the map datum etc. for example to the position of sending device 101.

Object is carried to the object (for example, the elderly etc.) that user wants monitoring by sending device 101.Sending device 101 With position sensor, which is believed using the position that such as GNSS (Global Navigation Satellite System) obtains its own Breath.That is, sending device 101 has for example for connecing from GPS (global positioning system) satellite as position sensor The reception mechanism of GPS signal is received, and obtains the location information (for example, latitude and longitude etc.) of its own in the appropriate case. Sending device 101 sends location information as radio signal in the appropriate case.

It should be noted that various types of sensors other than position sensor are mounted on sending device 101, and Sending device 101 can use radio signal to send the sensor information exported by sensor.For example, can be filled sending Set the sensor of the biological information of installation sensing such as pulse and heart rate on 101, the sensor of sensing temperature, humidity etc., detection The sensor of opening and closing, the door of door etc..

In Fig. 6, sending device 101-1 is carried by the elderly 111-1 in Tokyo, and sending device 101-2 is by the old of Yokohama Year, people 111-2 was carried.Sending device 101-3 is carried by the elderly 111-3 of Shizuoka.Further, sending device 101 has only One identification information (ID).For example, correspondingly, the identification information of sending device 101-1 is 0001 (ID=0001) in Fig. 6, hair The identification information for sending device 101-2 is 0002 (ID=0002), and the identification information of sending device 101-3 is 0003 (ID= 0003).The identification information of sending device 101 is registered in Cloud Server 103.

Position monitoring target is arbitrary.For example, the object of monitoring position can be children, such as dog or cat (pet) Animal, employee of company etc..Although showing three sending devices 101 in Fig. 6, the quantity of sending device 101 is arbitrary. Sending device 101 can be configured as special equipment, but it can be in conjunction with (such as, mobile in portable information processing apparatus Phone or smart phone) in.

Base station 102 can be any kind of.For example, base station 102 can be special facilities/building.Further, example Such as, base station 102 may be mounted in the roof of building, such as, common building object, apartment, house, roof etc..Further, For example, base station 102 can be portable device, it can be carried or be mounted in the moving body of such as automobile by user.

It is mounted with multiple base stations 102.For example, in the case of fig. 6, base station 102-1 is arranged in Tokyo, and base station 102- 2 are mounted on Fuji.Although Fig. 6 shows two base stations 102, the quantity of base station 102 is arbitrary.

Base station 102 has reception device 112.Reception device 112 receives radio signal from sending device 101, and will Cloud Server 103 is supplied to including information (data) in a radio signal.Further, reception device 112 needs parameter Collect (for example, the modulation rate of wireless signal, ON/OFF of frequency hopping etc.) as wireless format information to come from cloud service for determining The wireless format of the wireless communication of device 103, to obtain information.The method that reception device 112 obtains information from Cloud Server 103 It is arbitrary.

The configuration of Cloud Server 103 is arbitrary, and for example can be by any number of server and any number of Network is constituted.Multiple Cloud Servers 103 can be provided.

In such position informing system 100, identification information (ID) of the sending device 101 based on their own carries out frequency hopping Setting.That is, sending device 101 is arranged the transmission timing of each grouping based on identification information and sends frequency, and base Each grouping is sent in the setting.As described above, being sent by using frequency hopping, the generation of interference can be inhibited.Namely It says, can more reliably send information.

Further, by the way that transmission timing is arranged based on identification information and sends frequency, sending device 101 be can change often The transmission timing of a sending device 101 and the mode for sending frequency.In such a case, it is possible to inhibit from different sending devices It is clashed between 101 groupings sent.That is, information can more reliably be sent.

In addition, the reception device 112 of base station 102 obtains the identification information of sending device 101 from Cloud Server 103, and It is received based on the identification information.That is, being based on identification information, reception device 112 is with the transmission with sending device 101 Timing mode identical with set of frequency is sent is arranged reception timing and receives frequency.If be grouped in reception device 112 Transmission timing and transmission frequency can be specified by the identification information of sending device 101, then are enough to detect about transmission timing and hair Send frequency grouping (that is, receive timing and receive frequency shift make even if S/N than it is low when be relatively easy to detection point Group).It is thereby achieved that more highly sensitive reception.It is sent that is, more reliable information may be implemented.In addition, being not required to The processing of such as interblock interference is carried out in unnecessary timing and unnecessary frequency band, therefore can inhibit the increasing of load Add.

Furthermore it is possible to which priority to be attached to the identification information of sending device 101.It is affixed in priority from cloud service In the case where the identification information for the sending device 101 that device 103 obtains, reception device 112 is selected according to the priority of identification information Carry out the radio wave of the sending device 101 of free identification information mark.It can receive signal (grouping).In this case, may be used To realize that more reliable information is sent.

It should be noted that reception device 112 sends the received information about radio signal, for example, coming when receiving When from the radio signal of sending device 101, the content (data extracted from radio signal) of radio signal is sent To server 103.

Cloud Server 103 pre-register and manage about sending device 101 information (also referred to as end message) and about The information (also referred to as subscriber information) of user.End message may include such as identification information of sending device 101, send frequency Information, main positions etc..Further, subscriber information may include the surname of such as user (people for receiving position informing service) Name, age, gender, address, payment information, the identification information of sending device to be used, login ID, password etc..Certainly, terminal Information and subscriber information can respectively include any information, and the present invention is not limited to examples detailed above.

Further, Cloud Server 103 will be sent in predetermined timing or in response to the request etc. from reception device 112 The identification information of device 101 is sent to the reception device 112 of base station 102 (some or all of base stations 102).At this point, Cloud Server 103, which can supply base station 102 to base station 102, is likely to receive the identification information of the sending device 101 of its radio signal.Change sentence It talks about, Cloud Server 103 cannot supply base station 102 to base station 102 to be less likely to receive the sending device 101 of its radio signal Identification information.By doing so, the unnecessary interblock interference in the reception device 112 of base station 102 can be reduced, and can be with Inhibit the increase of load.

In addition, as base station 102 wants the quantity of received sending device 101 to increase, the probability of packet collisions also phase occurs It should increase.More precisely, due to from it is unlikely receive radio signal sending device 101 grouping by arrival can Energy property very little, so a possibility that actually occurring packet collisions will not be very high.However, what is executed in base station 102 is arranged in connects When receiving timing and receiving frequency, as the quantity of target sending device 101 increases, the probability that packet collisions occur also increases.Such as Described in upper, when receiving timing and receiving generation packet collisions in the setting of frequency, the reception of grouping is omitted.Therefore, if Reception device is to be less likely to receive the sending device 101 of radio signal as target, then receiving sensitivity unnecessarily drops It is low, and reduce the reliability of information transmission with may not be necessary.As described above, Cloud Server 103 does not supply base station 102 less The identification information of the sending device 101 of its radio signal may be received, so that such sending device 101 is sent out in base station 102 It send as reception target.In such a case, it is possible to inhibit the reduction of receiving sensitivity and realize that more reliable information is sent.

Further, Cloud Server 103 is obtained is obtained and receiving radio signal from the reception device 112 of base station 102 The reception information obtained.For example, being based on received information, Cloud Server 103 is recorded between sending device 101 and reception device 112 Information send/received history is (for example, the radio signal from which sending device 101 is sent to base station 102, connects When receiving apparatus 112 receives it etc.).Based on the history, Cloud Server 103 selects the hair that identification information is supplied to base station 102 Device 101 is sent, and according to selection result, Cloud Server 103 sends identification information (LEID (it is expected that ID list)) and supplied The reception device 112 of base station 102 should be given.In this way, the mistake sent by the reception device 112 based on each base station 102 Go communication history that the identification information of sending device 101 is supplied to the reception device 112 of each base station 102, it can be more accurately Determine the radio signal of each sending device 101.Therefore, more reliable information transmission may be implemented in each base station 102.

Further, Cloud Server 103 can be based on the reception information from reception device 112, will such as sending device The position of 101 (the elderlys 111) is supplied to the information processing terminal 104.

It should be noted that the mark letter of sending device 101 can be supplied from Cloud Server 103 to base station 102 in any form Breath.For example, Cloud Server 103 can be supplied to base station 102 for the identification information of sending device 101 as priority list.It should Priority list be include being supplied with the base station 102 of priority list to be likely to receive the sending device of its radio signal The information of the list of 101 identification information.For example, Cloud Server 103 generates the priority list of base station 102 and is supplied into Each base station 102, and the base station 102 for being supplied with priority list sends the wherein sign letter in priority list The transmission of breath.It can be processed for receiving radio signal from device 101.Furthermore it is possible to which the reception of base station 102 is preferential Grade is added to the identification information for being supplied to the sending device 101 of base station 102.For example, above-mentioned priority list may include each The priority of identification information.Then, the base station 102 for being supplied with priority list can be preferential based on include in priority list Grade carrys out received priority orders of setting signal etc..By doing so, Cloud Server 103 not only can control the reception of base station 102 The sending device 101 of radio signal, the priority orders that can also be controlled and received.It can also be from the position where base station 102 The difference between location information sent with sending device 101 obtains communication distance, and preferential according to the communication distance modification Grade.

Fig. 7 is the block diagram for showing the configuration example of sending device 101.Sending device 101 includes GPS signal receiving unit 201, has Imitate load data generating unit 202, ID/CRC addition portion 203, FEC processing unit 204, repeating portion 205, guard bit addition portion 206, close Key stream generating unit 211, with door 212, exclusive or A door 213, Gold code generating unit 214, XOR gate 215, synchronous generation unit 221, interleave unit 222, modulation unit 223 and frequency/timing control unit 224.In some embodiments, it can only provide The element 206-224 of single or selected quantity, and can usually be referred to as transmission unit.

GPS signal receiving unit 201 receives GPS signal, includes in acquisition 1PPS (pulse/sec) signal and GPS signal Current time (GPS time), and frequency/timing control unit 224 is supplied to as clock signal.In addition, GPS signal connects Receive unit 201 and obtain the location information (latitude, longitude, height above sea level) of sending device 101 from GPS signal, and using the position as The sensor information sensed is supplied to payload data generation unit 202.

Payload data generation unit 202 is from the position as the sensor information from GPS signal receiving unit 201 Information generates the payload data of the payload as radio signal, and is supplied to ID/CRC attached payload data Add unit 203.It should be noted that the information as payload data is not limited to location information, it further include sensor information.It can root According to the information for being for example determined as payload data using application of wireless system etc..However, new traffic method is a kind of For the new traffic method of LPWA communication, information can be sent in tens to 100km wide scope with low-power consumption, and use That makees the information of payload data is sized for LPWA communication, is desired to have certain size.

ID/CRC extra cell 203 adds the ID (identification information) of sending device 101 and CRC (cyclic redundancy check) code It is added to the payload data from payload data generation unit 202, to carry out FEC (forward error correction), generation will be located The FEC object element of reason, and it is supplied into FEC processing unit 204.ID/CRC extra cell 203 generates payload data Or the CRC code of payload data and ID.

204 pairs of FEC object elements from ID/CRC extra cell 203 of FEC processing unit (also referred to as FEC encoder) into Row FEC processing, and the fec frame obtained as a result is supplied to repetitive unit 205.That is, FEC processing unit 204 into The Error Correction of Coding of row FEC object element is handled as the FEC of FEC object element, and the error correction that will be obtained by Error Correction of Coding Code is supplied to repetitive unit 205.Specifically, in embodiments, FEC processing unit 204 carries out such as FEC object element LDPC coding, and the LDPC code obtained by LDPC coding is supplied to repetitive unit 205.It should be noted that error correction code is unlimited In LDPC code.As error correction code, for example, can be using convolutional code, turbo code etc..

Repetitive unit 205 (also referred to as frame forming portion or including frame forming portion) generate wherein repeatedly arrangement at FEC The repetitive unit of the LDPC code of unit 204 is managed, and is supplied into guard bit adding unit 206.Repetitive unit 205 is using this Disclosed various aspects, and will be explained in greater detail below.

Guard bit is added (insertion) to repetitive unit from repetitive unit 205 by guard bit addition portion 206, and is supplied into XOR gate 213.

Key stream generation unit 211 generates the key stream that be used for encrypting, and is supplied into and door 212.In addition to coming from Except the key stream of key stream generation unit 211, for switching validity/ineffectivity switching of the encryption in XOR gate 213 Signal is supplied to and door 212.

Switching signal is, for example, the logic 1 (for example, high-level) in the case where encryption enabled, and invalid in encryption In the case of logical zero (for example, low level).For example, switching signal can be arranged according to application.Switching signal can be set to So that from guard bit adding unit 206 be supplied to XOR gate 213 entire repetitive unit or repetitive unit a part it is effective Ground encryption.Further, switching signal, which can be set such that from guard bit adding unit 206, is supplied to XOR gate 213 The entire encryption of repetitive unit is invalid.

The logic product of switching signal and the key stream from key stream generation unit 211 is calculated with door 212, and is supplied To XOR gate 213.As a result, Cong Yumen 212 is mentioned to XOR gate 213 during only encrypting the effective period in switching signal For key stream.

XOR gate 213 is by calculating repetitive unit from guard bit addition portion 206 and from the key stream with door 212 Exclusive or encrypts repetitive unit with stream cipher (method).The repetitive unit of encryption is supplied to XOR gate 215 by XOR gate 213.This In, in XOR gate 213, it will supply the period (that is, period that switching signal is in logic 1) from the key stream with door 212 Encryption.Therefore, in XOR gate 213, all or part of of repetitive unit can be encrypted or entire repetitive unit It can not be encrypted.For example, Gold code generating unit 214 is generated for example using two M sequence generators and XOR gate 215 Scramble sequence of the Gold code as size (digit) same size (digit) with the repetitive unit from XOR gate 213.It is different Or door 215 is by calculating the different of repetitive unit from XOR gate 213 and the scramble sequence from Gold code generating unit 214 Or repetitive unit is scrambled, and be supplied into interleave unit 222.

Synchronous generation unit 221 generates scheduled PN (pseudo noise) sequence (such as, M sequence) for example as synchronization signal, And it is supplied into interleave unit 222.It should be noted that being sending device 101 by the synchronization signal that synchronous generation unit 221 generates With signal known to reception device 112.Due to 112 known synchronization signal of sending device 101 and reception device, so reception device 112 can carry out the synchronous detection of the radio signal from sending device 101, can carry out the nothing from sending device 101 The steady reception of line electric signal.The initial value of M sequence can be any value, if it be common value for sending and receiving i.e. It can.The initial value of M sequence can also be changed according to ID.

Intertexture portion 222 carries out bit sequence d (0), d (1) ... as from XOR gate 213 and bit sequence r (0), r (1) ... And interleaved sequence r (0), d (0), r (1), d (1) ... or r0 (0), d (0), d (832), r (1), d (1) ... to modulation portion 223 repetitive unit.

Modulation unit 223 is using the interleaved sequence for example supplied from interleave unit 222 (for example, 920MHz band radios Signal is as the modulated signal obtained by the above method) it is modulated, such as, pi/2 shifts BPSK, and (pi/2 shifts binary system Phase-shift keying (PSK)) modulation and linear modulation.It should be noted that modulation unit 223 is according to the control from frequency/timing control unit 224 With transmission timing and send frequency transmission radio signal.

Frequency/timing control unit 224 is sent according to the setting such as ID of sending device 101 by modulation unit 223 wireless The transmission timing and transmission frequency of signal, and with transmission timing and frequency transmission wireless signal is sent, and control modulation portion 223.Frequency/timing control unit 224 controls modulation unit with the clock signal synchronization from GPS signal receiving unit 201 223.That is, according to the clock signal from GPS signal receiving unit 201, for example, frequency/timing control unit 224 is true Whether timing is known grid (predetermined timing) in sending device 101 and reception device 112 before settled.Frequency/timing controlled Whether the current timing of unit identification is timing (grid time), and controls modulation unit 223 to start at grid timing The transmission of grouping.

Fig. 8 is the block diagram for showing the configuration example of reception device 112.Reception device 112 includes GPS signal receiving unit 231 (or generally receiving unit), ID/ sending mode acquiring unit 232, frequency/timing control unit 233, demodulating unit 234 (indicate And/or including frame extraction unit) and decoding unit 235 (indicating fec decoder device).

GPS signal receiving unit 231 receives GPS signal, includes in acquisition 1PPS (pulse/sec) signal and GPS signal GPS time, and frequency/timing control unit 233 is supplied to as clock signal.For example, ID/ sending mode acquiring unit 232 obtain sending mode from Cloud Server 103, which is that reception device 112 is received as from timing control unit ID, transmission timing and the mode for sending frequency of the sending device 101 of the reception target of 233 radio signal.

Frequency/timing control unit 233 is single in demodulation according to the sending mode from ID/ sending mode acquiring unit 232 The reception timing of radio signal is set in member 234 and receives frequency, and to receive timing and receive frequency reception aerogram Number, to control demodulating unit 234.As the frequency timing control unit 224 in Fig. 7, frequency/timing control unit 233 Demodulating unit 234 is controlled with the clock signal synchronization from GPS signal receiving unit 231.

As described above, the transmission timing of modulation portion 223 (Fig. 7) and the control of transmission frequency and the reception of demodulation section 234 are fixed When and receive frequency control and controlled by the clock signal that is obtained from GPS signal, can be by and by synchronous with temporal information The transmission timing of modulation portion 223 and the reception timing of transmission frequency and demodulation section 234 are accurately matched with frequency is received.

Demodulating unit 234 receives timing according to the control of frequency/timing control unit 233 and receives frequency reception and comes from The radio signal of sending device 101 carries out FFT (Fast Fourier Transform (FFT)) of radio signal etc. and demodulates aerogram Number.The demodulated signal obtained by demodulation radio signal is supplied to decoding unit 235 by demodulating unit 234.In decoding unit In 234 demodulation, for example, carrying out the synchronous detection using synchronization signal, and also carry out combining described in Fig. 2.

Decoding unit 235 is carried out by the way that decoding includes the LDPC code in the decoded signal from demodulating unit 234 Error correction, and exporting includes the sensor information in the payload data obtained as a result.The sensor information is from connecing Receiving apparatus 112 is sent to Cloud Server 103.

Fig. 9 is the diagram for showing the example of data (signal) of the first format handled by sending device 101.Here, In In new traffic method, for example, the modulation rate (transmission rate) carried out in modulation portion 223 is 6.35kbps and 50.8kbps. Fig. 9 shows the data format when modulation rate is the 6.35kbps in 6.35kbps and 50.8kbps.

In new traffic method, for example, preparing the mode of three types (that is, MSDU Class1, MSDU type 2 and MSDU class Type 3) it is used as payload data Setting pattern.Payload data is for example known as MSDU (MAC (media access control) clothes Be engaged in data cell) 128 bit locations.In the case where MSDU Class1, MSDU type 2, MSDU type 3, real data length point It is not 128,64 or 1.It is for sending data (user data).That is, in MSDU Class1, payload Data generating unit 202 uses 128 real data (sensor information etc.) as former state to construct (generation) 128 MSDU service numbers According to unit.In MSDU type 2, payload data generation unit 202 fills up 64 real data with the 0 of 64 to be formed 128 MSDU.In MSDU type 3, payload data generation unit 202 fills up 1 real data with the 0 of 127 with shape At 128 MSDU.

MSDU type depends on application.For example, the transmission of location data can need 128 (Class1), and other are sensed Device can only send less information.It is detected for binary sensor data (ON/OFF, true/false), such as early earthquake Device, a data bit are sufficient (type 3).In general, real data length can be less than or equal to predetermined maximum (example Such as, up to 128) arbitrary number.MSDU types index is for example collectively stored on Cloud Server with device id (userID), is made It obtains receiver and knows real data length.

In 128 MSDU, 32 ID and 24 CRC codes of sending device 101 are added to ID/CRC appendix 203 In, wherein PSDU (physical layer services unit) is used as FEC object element, and it becomes 184 units.

In FEC processing unit 204, for example, it is 736 and encoding rate r that 184 PSDU, which are encoded as code length N, For 1/4 LDPC code, the LDPC code (bits of coded) of 736 (=184 × 4/1) is generated.

In the first format that modulation rate is 6.35kbps, 736 LDPC codes are repeated twice, and further Ground repeats 184 bit positions of 736 LDPC codes to generate 1656 (=736 × 2+184) repetitive units.Namely It says, in the first format, arranges that 736 LDPC codes twice and further arrange the 184 of 736 LDPC codes by repeating Bit position configures repetitive unit.

As 184 bit positions of the 736 LDPC codes arranged in repetitive unit, for example, 736 LDPC can be used First 184 of code.In addition, according to the disclosure, can be selected to arrange in repetitive unit according to scheduled Optimizing Mode 184 bit positions of 736 LDPC codes.Guard bit addition (insertion) is arrived repetitive unit by guard bit adding unit 206.Namely It says, 4 guard bits (G) is added to each of head and the end of repetitive unit.By adding guard bit, 1656 Repetitive unit becomes the repetitive unit of 1664 (=1656+4 × 2).As 4 guard bits, can using full 0 position or Indicate the counter of frame number.

Here, in the FFT of the repetitive unit carried out in the demodulating unit 234 (Fig. 8) of reception device 112, repetitive unit At the end of signal quality deteriorate.As the countermeasure for preventing signal quality from deteriorating, guard bit is added to repetitive unit respectively Head and end.For repetitive unit, XOR gate 213 calculates the exclusive or with key stream, so that repetitive unit becomes encryption stream.

Here, when the Setting pattern of payload data is MSDU type 2 or MSDU type 3, as payload number According to a part of 128 MSDU to be padded be 0.Since MSDU type 2 fills up 64 real data with the 0 of 64,128 The half of position MSDU is 0.In other words, the MSDU of half is meaningless information.In MSDU type 3, due to 1 actual number It is filled up according to 127 0, therefore the major part of 128 MSDU is meaningless information.

In new traffic method, (in MSDU type 2 or MSDU class there are many such meaningless informations In the case where type 3), it carries out configuration and allows to effectively utilize the wireless energy for being sent to communication path to the maximum extent. That is the data (part or all of) filling up 0 and generating cannot be encrypted in new traffic method.It is not encrypted when filling up 0 When, Xiang Yumen 212 supplies switching signal, for keeping the encryption for filling up the period 0 in repetitive unit invalid.Believe in response to switching Number, key stream is supplied to XOR gate 213 with door 212, thus in XOR gate 213, XOR gate 213 is not invalid in encryption Key stream is generated in period (that is, encrypting the effective period).Use and encrypts repetition as target from the key stream with door 212 Unit.In encrypting invalid part, fills up 0 data and exported as it is without encrypting.Known invalid encryption in this way Part is the data 0 in reception device 112.It therefore, can be by the way that nothing will be encrypted in the demodulating unit 234 of reception device 112 The signal of effect part is considered as synchronization signal to improve net synchronization capability.It equally, can be invalid by that will encrypt in demodulation section 235 Partial decoding of h be given data " 0 " Lai Gaishan error-correcting performance.That is, by partly making to encrypt in short-term in payload In vain, the performance of reception device 112 is improved.By this performance improvement, for example, even if under lower transmission antenna power Also equivalent communication performance may be implemented.

As repetitive unit before encrypting, encryption stream is formed by 1664.1664 bit encryption streams are passed through by XOR gate 215 The exclusive or for using gold code as scramble sequence is scrambled, and becomes scrambling stream.It is similar with the password stream before scrambling, scrambling Stream is 1664 bit sequence d (0), d (1) ... d (1663).

The first format for being 6.35kbps for modulation rate, synchronous generation unit 221 generate bit sequence r (0), r (1) ... r (831) is used as 832 bit synchronization signals (Sync).Therefore, the first format for being 6.35kbps for modulation rate, together The length ratio of the length and scrambling stream that walk signal is 832:1664=1:2.

As the bit sequence r (0) of 832 bit synchronization signals, r (1) ... r (831) and as the position sequence of 1664 scrambling stream Column d (0), d (1) ... d (1663) interweave in intertexture portion 222.As a result, generating bit sequence r (0), d (0), d (832), r (1), d (0), d (0), d (0), d (2) etc. are used as 2496 PPDU (Presentation protocol data unit) (1), d (833) ....

Here, for example, being interweaved bit sequence r (0), r (1) ... r as 832 bit synchronization signals according to following c program (831) and bit sequence d (0), d (1) are used as 1664- ... d (1663).It should be noted that PPDU (n) is indicated from 2496 PPDU The position (n+1) on head, and (n%x) indicate by by n divided by x and the remainder that obtains.Symbol "==" indicate that judgement calculates As a result whether equal.In addition, wherein n is dividend in division calculation (n/3 etc.), decimal point decimal below is cast out:

For (n=0；n<2496；n++){

If ((n%3)==0) PPDU (n)=r (n/3)；

If ((n%3)==1) PPDU (n)=d (n/3)；

If ((n%3)==2) PPDU (n)=d (n/3+1)；

}

For 2496 PPDU, the pi/2 displacement BPSK modulation of 6.35kbps is carried out by modulator 223, and further into The linear modulation of row 400kHz/s.Then, 2496 PPDU are sent as radio signal.

For 2496 PPDU, in the pi/2 displacement BPSK modulation of application 6.35kbps, the transmission of 2496 PPDU (transmission) time is about 393.2ms.This is transmission in 0.4 second or shorter, and meets the ARIB rule of 920MHz frequency band.

For linear modulation (chirp modulation), for example, provided when the transmission of PPDU starts about- The frequency displacement of 78.6kHz, transmission time are about 393.2ms.For the linear modulation of 400kHz/s, frequency is with the change of 400kHz/s Rate linear change, therefore the frequency displacement at the end of PPDU that transmission time is about 393.2ms is sent is about+78.6kHz.Example Such as, when the frequency of carrier wave (centre frequency) is 925Mhz, the signal frequency of radio signal by linear modulation from 924.9214MHz linearly variation is 925.0786MHz.Using the linear modulation, even if using the modulation rate of 6.35Kbps, It is anti-interference to become strong since efficiency of frequency employment improves, and caused by the characteristic due to linear modulation can also be reduced Calculation amount involved in synchronous detection.

For the first format, sending device 101 repeats (for example, four times) and sends PPDU as grouping.In this case, Time needed for four times of PPDU are sent is about 1.57 seconds (=393.2ms × 4).

In the present embodiment, a type of LDPC code quilt that code length N is 736 and encoding rate r is 1/4 Prepare to be used as LDPC code, and the Setting pattern of payload data is MSDU Class1, MSDU type 2 and MSDU type 3, is filled out 184 PSDUs of 0 composition as FEC object element are mended, are to be used for each Setting pattern by the LDPC coding specification of 184 PSDU A seed type LDPC code, be prepared for each Setting pattern, for example, carrying out each set in the case where not filling up 0 LDPC code can be used to carry out LDPC coding for the Setting pattern in the LDPC coding for setting the real data in mode.

However, sending device 101 needs for the storage of each Setting pattern when preparing LDPC code for each Setting pattern The check matrix of LDPC code, and in LDPC coding, need the processing of such as switching matrix.On the other hand, when sending When the use of code length N being 736 in device 101 and a type of LDPC code that encoding rate r is 1/4, for this LDPC code stores the check matrix of a type of LDPC code and need not switch check matrix, so as to reduce Therefore load simultaneously reduces power consumption.

Figure 10 is the diagram for showing the example of data of the second format handled by sending device 101.That is, Figure 10 Show the data format when modulation rate is the 50.8kbps in 6.35kbps and 50.8kbps.

In the second format, the MSDU as payload data, the PSDU as FEC object element are and LDPC is compiled The case where code is with the first format (Fig. 9) is identical, therefore omits description.In the second format that modulation rate is 50.8kbps, 736 The LDPC code of position repeats six times, and further, repeats 384 of 736 LDPC codes, with generate 4800 (= 736 × 6+384) repetitive unit.That is, in the second format, by repeating to arrange 736 LDPC codes six times simultaneously And arrange 384 bit positions of 736 LDPC codes further to configure repetitive unit.

As 384 bit positions of the 736 LDPC codes arranged in repetitive unit, for example, can be using 736 First 384 of LDPC code.In addition, the cloth in repetitive unit can be selected according to scheduled Optimizing Mode according to the disclosure 384 bit positions of the 736 LDPC codes set.

For repetitive unit, as 4 guard bits (G) are added to head and end respectively in the case where the first format End.By adding guard bit, 4800 repetitive units become the repetitive unit of 4808 (=4800+4 × 2).Hereafter, In the second format, flows as in the case where the first format, 4808 repetitive units are encrypted to encrypt, further added It disturbs, and scrambling stream is made.In the second format, scrambling stream is size position d identical with the addition repetitive unit of guard bit (0), 4808 bit sequences of (1) d ... d (4807).

For the second format, synchronous generation unit 221 generate bit sequence r (0), r (1) ... r (0) ... r (0) as with Identical 4808 bit synchronization signal (Sync) of scrambling 4087 sizes of stream.Therefore, for the second format, the length of synchronization signal with plus The length ratio of flow-disturbing is 4808:4808=1:1.

As the bit sequence r (0) of 4808 bit synchronization signals, r (1) ... r (4807), as the position sequence of 4808 scrambling stream Column d (0), d (1) ... and d (4807) are interweaved by intertexture portion 222.As a result, generating as 9616 (=4808+4808 Position) PPDU bit sequence r (0), d (0), r (1), d (1) and d (0), wherein being periodically inserted as synchronization signal Position.Here, as the bit sequence r (0) of 4808 bit synchronization signals, r (1) ... r (4807) and as the position of 4808 scrambling stream Sequence is d (0), d (1) ... d (4807) is interleaved according to following c program, such as:

For (n=0；n<9616；n++){

If ((n%2)==0) PPDU (n)=r (n/2)；

If ((n%2)==1) PPDU (n)=d (n/2)；

}

For 9616 PPDU, the pi/2 displacement BPSK modulation of 50.8kbps is carried out by modulation unit 223, and is made For radio signal transmission.By the pi/2 of 50.8kbps displacement BPSK modulated applications when 9616 PPDU, 9616 PPDU's Transmission time is about 189.4ms.As it be less than ARIB as defined in 0.2 second, can be with short transmission time out weight Recurrence is sent repeatedly.

About the second format, sending device 101 repeats to send PPDU as grouping, such as 20 times.In this case, it sends out Time needed for sending 20 PPDU is about 3.78 seconds (=189.4ms × 20).In the second format, very due to number of repetition It is more, even if can also more reliably send information in the presence of such as weak influence.

Select the first format and the second format to have and apply required different weak characteristic etc., thus can by application into Row selection.

In Figure 11, key stream generation unit 211 includes Key generating unit 251, nonce (Nonce) generation unit 252, block encryption unit 253 and P/S converting unit 254.Key stream generation unit 211 generates the key stream for encryption.For First format, key stream generation unit 211 generate 1664 key streams and generate 4808 key streams for the second format.

Key generating unit 251 generates 128 key informations.About Key generating unit 251, undisclosed internal structure, And ensure the safety of encryption.About Key generating unit 251, as long as being not easy to guess internal structure, configuration can be with It is any configuration.For example, Key generating unit 251 can be by obtaining GPS time simultaneously from GPS signal receiving unit 201 (Fig. 7) And addition zero data makes digit become 128 to obtain (generation) key information.Key generating unit 251 is by the key of generation Information is supplied to block encryption unit 253.

Nonce generation unit 252 generates 128 nonces (expendable number).For nonce, it is contemplated that every time It will be different divided by value when 128 by bit clock.For example, nonce generation unit 252 can be made of 128 digit counters.At this In the case of kind, for example, counter is initialized as preset count before starting to send wireless signal by nonce generation unit 252 Then count value is increased by 1 divided by 128 each timing in bit clock by value.Thus, it is possible to generate nonce.Nonce generates The nonce of generation is supplied to block encryption unit 253 by unit 252.

Block encryption unit 253 is using the key information from Key generating unit 251 and comes from nonce generation unit 252 Nonce generate 128 block encryptions, and block encryption is supplied to P/S converting unit 254.As block cipher, for example, can To use AES (Advanced Encryption Standard) code, CLEFIA code etc..

P/S converter 164 carries out the block encryption as unit of 128 from block encryption unit 253 as unit of 1 (parallel-to-serial) conversion of P/S, to generate serial key stream (1 unit), and is supplied into and door 212.For first Format, P/S converter 164 generate 1664 key streams, and for the second format, generate 4808 key streams.

According to the disclosure, FEC encoder 204 is configured as payload data being encoded to FEC code word 300,400 (referring to Fig. 9 and Figure 10), each FEC code word have predetermined code word length.Frame forming portion (indicated by repetitive unit 205 or Include in repetitive unit) it is configured to form the frame 310,410 with predetermined frame length.Then, transport stream 320,420 is by institute State the formation of multiple frames 310,410 of frame forming portion formation.This will be explained in greater detail below.

Frame 310 is individually shown in Figure 12, and frame 410 is individually shown in Figure 13.As shown in these figures, Frame 310,410 includes the first frame part 311,411 with the first predetermined length of integral multiple of predetermined code word length, and Second frame part 312,412 of the second predetermined length with shorter than predetermined code word length.In addition, in the exemplary embodiment party In formula, the third frame part 313,413 and the 4th frame part 314,414 for respectively including guard bit are provided；However, in other realities Apply in mode, other than first frame part and the second frame part, do not provide such third frame part and the 4th frame part, Or other one or more frame parts.Guard bit can for example provide the information about the frame number in superframe, for example, guard bit It is 0000 for first frame, is 0001 for the second frame, and so on (is repeated at the beginning and end of frame 310,410).

Frame 310 is preferably used for the format 1 (6.35K is linear (Chirp)) of Fig. 9, and frame 410 is preferably used for the lattice of Figure 10 Formula 2 (50.8K DSSS).50.8K mode uses 8 times of big bandwidth, this will be generated in additive white Gaussian noise (AWGN) channel Noise power more than 8 times.Therefore, compared with only 2 FEC code words repeat in the case where format 1, more FEC have been used Code word 400 repeats (6 times).A kind of mode of larger noise level is accurately by FEC code in the case of full remuneration format 2 Word 400 is used more than 8 times.Another way is only partially to increase the quantity of FEC code word, and in addition further increase hair The quantity of the frame 410 sent.

Frame forming portion was configured to the predetermined of FEC code word 300,400 and the FEC code word 300,400 The repetition of quantity covers in the first frame part 311,411 of frame, and by the selected quantity of the FEC code word 300,400 Position cover in the second frame part 312,412 of the frame.As shown in Figure 12, first frame part 311 includes code word 300 Two repetitions.As shown in Figure 13, first frame part 411 includes two repetitions of code word 400.

Figure 14 and Figure 15 respectively illustrates code word 300 and 400 and a part of code word 300,400 is included in second Various options in frame part 312,412.In these illustrative embodiments, code word 300,400 be system code, especially It is the code word of LDPC code, and as shown in Figure 14 A and Figure 15 A, the message part 315,415 including 184 information bits With the parity portion 316,415 of 552 parity check bits, in total 736 code bits.However, in other embodiments, The position of other codes and other quantity can be applied.

Figure 14 B to Figure 14 H shows a part in the second frame part 312 of frame 310 including code word 300 Seven different options.These parts are in these figures with the instruction of individual hacures.(refer to Fig. 9 and Figure 12 in this embodiment Shown in embodiment), the second frame part 312 include 184 positions.

It only include information bit in the second frame part 312 according to first mode shown in Figure 14 B (referred to as mode 0) (especially complete message part 315).This makes these information bits by stronger protection.

The example that FEC code can be low-density checksum (LDPC) code has the degree spectrum of optimization, to allow with very Low SNR is decoded.In the preferred embodiment, LDPC code is system, and in the odd even school of parity matrix It tests in part using double diagonal line (that is, system code, and parity check code will be accumulated).This causes degree of variation to be 2 odd even Verification (only 2 output sides (connecting) carry out check-node).This affects 551 even-odd checks in 552 parity check bits. The last one parity check bit only has 1 degree.However, information bit uses biggish degree, such as 10 degree, 9 degree and partly 3 degree. Whole degree spectrum is influenced by code optimization.It should be noted that code bit the disappearing in fec decoder device with small variable node degree Limited amount information is only collected during breath transmitting decoding.Therefore, it is beneficial for repeating the even-odd check of LDPC code word, because it Have lesser variable node degree.

It only include odd even school in the second frame part 312 according to second mode shown in Figure 14 C (referred to as mode 1) Test position (especially 184 minimum valid parity check positions (rightmost position for being defined as bit sequence) of parity portion 316 317).This provides the stronger protection to weak even-odd check, to improve code convergence, and is easily achieved.However, compared with Strong parity check bit is locally gathered in FEC code word very much, and fec decoder device may not be allowed to converge to low level error code Rate.

According to the third and fourth mode shown in Figure 14 D and Figure 14 E (referred to as mode 2 and 3), in the second frame part Equally distributed code bit 318 (including information bit and even-odd check in all code bits in 312 comprising code word 300 Position).This, which is provided, to be evenly distributed in complete code word by separately protected position, this in all code bits for having There is the code of equal error protection (EEP) can be beneficial.In the preferred embodiment, using irregular LDPC code, Middle code bit has unequal error protection (UEP), and compared with last (even-odd check) position, first code bit is more steady.

The the five, the 6th and the 7th mode (referred to as mode 4,5 and 6), according to shown in Figure 14 F, Figure 14 G, Figure 14 H It only include parity check bit, the even-odd check being especially evenly distributed on parity portion 316 in second frame part 312 Position 318.This makes these parity check bits 319 by stronger protection.It should be noted that illustrating only three for mode 5 and 6 Weight parity check bit 320 is to indicate the different modes for being evenly distributed parity check bit 319 to be protected.These modes (4,5 and 6) it is easily achieved (conventional structure), and equally distributed even-odd check is allowed to repeat.This leads to generally optimal fec decoder Performance.

Figure 15 B to Figure 15 H shows a part in the second frame part 412 of frame 410 including code word 400 Seven different options.These parts are in these figures with the instruction of individual hacures.(refer to Figure 10 and Figure 13 in this embodiment Shown in embodiment), the second frame part 412 include 384 positions.

According to first mode shown in Figure 15 B (referred to as mode 0), specifically, included in the second frame part 412 Whole message part 415 and highest effectively (the leftmost position for being defined as bit sequence) (200) parity check bit 423.This makes These information bits are obtained by stronger protection.

It only include odd even school in the second frame part 412 according to second mode shown in Figure 15 C (referred to as mode 1) Test position (especially 352 minimum valid parity check positions (rightmost position for being defined as bit sequence) of parity portion 416 417).This more strongly to protect weak even-odd check, and thereby improves code convergence.

According to the third and fourth mode shown in Figure 15 D and Figure 15 E (referred to as mode 2 and 3), in the second frame part Equally distributed code bit 418 (including information bit and even-odd check in all code bits in 412 comprising code word 400 Position).Further, the longer portion of the code bit in the second frame part 412 comprising beginning or end from code word 400 421 (being 32 here).This is provided by separately protected position and longer portion 421 is evenly distributed in complete code word On, other than a small amount of exception at the start and end in code word, wherein 32 blocks are repeated.

The the five, the 6th and the 7th mode (referred to as mode 4,5 and 6), according to shown in Figure 15 F, Figure 15 G, Figure 15 H It only include parity check bit, the even-odd check being especially evenly distributed on parity portion 416 in second frame part 412 Position 419.Further, equally in these embodiments, comprising coming from parity portion 416 in the second frame part 412 End parity check bit longer portion 422 (being 48 here).This make these parity check bits 419 and 422 by Stronger protection.It should be noted that illustrating only triple parity position 420 for mode 5 and 6 to indicate to be evenly distributed to want The different modes of the parity check bit 419 of protection.

The 8th mode (referred to as mode 7) according to shown in Figure 15 I, 384 duplicate positions 424 are with the mould of complete rule Formula (referred to as mode _ 23) is evenly distributed on parity portion 416, without repeating bulk towards the end of code word (as in mode 4,5 and 6).This is easily achieved (conventional structure), and equally distributed even-odd check is allowed to repeat.This leads Cause generally optimal fec decoder performance.

Frame extraction unit is generally comprised according to the reception device of the disclosure, which is configured as from received transmission One or more frames are extracted in stream, frame includes the payload for being encoded to the FEC code word for being respectively provided with predetermined code word length Data, and frame has predetermined frame length.As explained above, frame include have predetermined code word length integral multiple first The first frame part of predetermined length, and the second frame part of the second predetermined length with shorter than predetermined code word length.Frame Extraction unit is configured to extract the predetermined quantity of FEC code word and the FEC code word from the first frame part of frame Repetition, and extract from the second frame part of the frame position of the selected quantity of the FEC code word.Further, it mentions Fec decoder device is supplied, which is configured as the weight of the FEC code word extracted from the frame, the FEC code word The position decoding payload data of the selected quantity of the multiple and described FEC code word.

Using it is disclosed in the second frame part use duplicate code bit device and method, may be implemented SNR and The improvement of coding gain.Other than the code word in first frame part, the code bit in the second frame part is led to by fec decoder device The soft value for crossing cumulative solution code bit is come using to increase signal level, so as to improve coding gain and SNR.

Therefore, discussed above only to disclose and describe the illustrative embodiments of the disclosure.As those skilled in the art will Understand, without departing substantially from the spirit or essential attributes of the disclosure, the disclosure can embody in other specific forms.Cause This, the disclosure of the disclosure is intended to illustrative, rather than limits the scope of the present disclosure and other claims.Including The disclosure of any easily recognizable variant of teachings herein partly limits the range of foregoing claim terminology, so that not having Creative theme is exclusively used in the public.

In the claims, word " comprising " is not excluded for other elements or step, and indefinite article " one (a) " or " one A (an) " is not excluded for multiple.The function of several recorded in claim may be implemented in discrete component or other units.Only It is that the fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures is consequently not used for It improves.

In the reality that the data processing equipment (at least partly) being up to the present described as through software control is implemented It applies in mode, it should be understood that the non-temporality machine that CD, disk, semiconductor memory etc. carry such software can It reads medium and is also considered as expression embodiment of the present disclosure.Further, this software can also be distributed otherwise, example Such as via internet or other wired or wireless telecommunication systems.

The element of disclosed unit and system can realize by corresponding hardware and/or software element, example Such as circuit appropriate.Circuit be include conventional circuit elements electronic building brick structure combination, including specific integrated circuit, standard The integrated circuit of integrated circuit, Application Specific Standard Product and field programmable gate array.In addition, circuit includes being compiled according to software code Journey or the central processing unit of configuration, graphics processing unit and microprocessor.Although circuit includes the software that above-mentioned hardware executes, But circuit does not include pure software.

It is the list of the other embodiments of disclosed theme below:

1. a kind of sending device, particularly for poor throughput network, the sending device includes:

FEC encoder is configured as payload data being encoded to the FEC generation for being respectively provided with predetermined code word length Code word,

Frame forming portion is configured to form the frame with predetermined frame length, wherein frame includes having predetermined code word length The first frame part of first predetermined length of the integral multiple of degree, and the second predetermined length with shorter than predetermined code word length The second frame part, wherein the frame forming portion is configured as the predetermined quantity of FEC code word and the FEC code word Repetition covers in the first frame part of frame, and the position of the selected quantity of the FEC code word is covered the of the frame In two frame parts.

2. according to sending device described in embodiment 1,

Wherein, the frame forming portion is configured as only including to the second of the frame by the parity check bit of FEC code word In frame part.

3. according to sending device described in embodiment 2,

Wherein, the frame forming portion is configured as all parity check bits or parity check bit of FEC code word most Low live part covers in the second frame part of the frame.

4. according to sending device described in embodiment 2,

Wherein, the frame forming portion is configured as the equally distributed surprise in all parity check bits by FEC code word Even parity bit covers in the second frame part of the frame.

5. according to sending device described in embodiment 1,

Wherein, the frame forming portion is configured as that the information bit of FEC code word is only covered to the second frame portion of the frame In point.

6. according to sending device described in embodiment 5,

Wherein, the frame forming portion is configured as minimum effective portion by all information bits of FEC code word or information bit Divide in the second frame part for covering the frame.

7. according to sending device described in embodiment 1,

Wherein, the frame forming portion is configured as code bit in all code bits by FEC code word and is evenly distributed to institute It states in the second frame part of frame.

8. according to sending device described in embodiment 1,

Wherein, the frame forming portion is configured as all information bits of FEC code word and a part of parity check bit It covers in the second frame part of the frame.

9. according to sending device described in any aforementioned embodiments,

Wherein, the FEC encoder is configured as payload data being encoded to the FEC code word of system code.

10. according to sending device described in any aforementioned embodiments,

It further include transmission unit, which is configured as forming transport stream from the multiple frames formed by the frame forming portion.

11. according to sending device described in embodiment 10,

Wherein, the transmission unit includes modulation portion, which is configured with linear modulation or Direct Sequence Spread Spectrum It modulates to modulate include data in frame.

12. according to sending device described in embodiment 10,

Wherein, the transmission unit include for include the data in frame encrypted encryption unit, for comprising Data in frame carry out scrambled scrambling portion and/or for including intertexture portion that the data in frame are interleaved.

13. a kind of sending method, particularly for poor throughput network, described sender method includes:

Payload data is encoded to the FEC code word for being respectively provided with predetermined code word length,

Form the frame with predetermined frame length, wherein by by the predetermined quantity of FEC code word and the FEC code word Repetition cover the first frame part of frame and by the way that the position of the selected quantity of the FEC code word is covered the frame Second frame part, frame include having the first frame part of the first predetermined length of integral multiple of predetermined code word length and having Shorter than the second frame part of the second predetermined length of predetermined code word length.

14. a kind of reception device, particularly for poor throughput network, the reception device includes:

Frame extraction unit is configured as extracting one or more frames from received transport stream, and frame includes being encoded to have respectively There is the payload data of the FEC code word of predetermined code word length, and frame has predetermined frame length, wherein frame includes tool There is the first frame part of the first predetermined length of the integral multiple of predetermined code word length, and there is shorter than predetermined code word length The second predetermined length the second frame part, wherein the frame extraction unit is configured as extracting FEC from the first frame part of frame The repetition of the predetermined quantity of code word and the FEC code word, and the FEC generation is extracted from the second frame part of the frame The position of the selected quantity of code word, and

Fec decoder device, be configured as the FEC code word extracted from the frame, the repetition of the FEC code word and The position decoding payload data of the selected quantity of the FEC code word.

15. according to reception device described in embodiment 14,

It further include receiving unit, which is configured as receiving the transport stream formed by multiple frames, and frame includes being encoded to point Not Ju You predetermined code word length FEC code word payload data.

16. a kind of method of reseptance, particularly for poor throughput network, the method for reseptance includes:

One or more frames are extracted from received transport stream, frame includes being encoded to be respectively provided with predetermined code word length FEC code word payload data, and frame have predetermined frame length, wherein by being mentioned from the first frame part of frame Take the repetition of the predetermined quantity of FEC code word and the FEC code word and by extracting from the second frame part of the frame The position of the selected quantity of the FEC code word, frame include first predetermined length with the integral multiple of predetermined code word length First frame part and the second frame part of the second predetermined length with shorter than predetermined code word length, and

The repetition of the FEC code word, the FEC code word extracted from the frame and selecting for the FEC code word The position decoding payload data of quantity.

17. a kind of non-transitory computer readable recording medium, wherein computer program product is stored with, when the computer Make to execute the method according to 13 or 16 when program product is executed as processor.

18. a kind of computer program, including program code means, when the computer program executes on computers, The program code means are used for so that the step of computer executes the method according to embodiment 13 or 16.

Claims (13)

1. a kind of sending device, particularly for poor throughput network, the sending device includes:

FEC encoder is configured as payload data being encoded to the FEC code word for being respectively provided with predetermined code word length, And

Frame forming portion is configured to form the frame with predetermined frame length, wherein frame includes having the predetermined code word length Integral multiple the first predetermined length first frame part, and the second pre- fixed length with the shorter than described predetermined code word length Second frame part of degree, wherein the frame forming portion is configured as the predetermined quantity of FEC code word and the FEC code word Repetition cover in the first frame part of frame, and the position of the selected quantity of the FEC code word covered described In second frame part of frame.

2. sending device according to claim 1,

Wherein, the frame forming portion is configured as only including to described in the frame by the parity check bit of the FEC code word In second frame part.

3. sending device according to claim 2,

Wherein, the frame forming portion is configured as all parity check bits or the parity check bit of the FEC code word Minimum live part cover in second frame part of the frame.

4. sending device according to claim 2,

Wherein, the frame forming portion is configured as the equally distributed surprise in all parity check bits of the FEC code word Even parity bit covers in second frame part of the frame.

5. sending device according to claim 1,

Wherein, the frame forming portion is configured as that the information bit of the FEC code word is only covered described the second of the frame In frame part.

6. sending device according to claim 5,

Wherein, the frame forming portion is configured as having all information bits of the FEC code word or the minimum of the information bit Effect part covers in second frame part of the frame.

7. sending device according to claim 1,

Wherein, the frame forming portion is configured as the code bit in all code bits of the FEC code word being evenly distributed to In second frame part of the frame.

8. sending device according to claim 1,

Wherein, the frame forming portion is configured as a part by all information bits of the FEC code word and parity check bit It covers in second frame part of the frame.

9. sending device according to claim 1,

Wherein, the FEC encoder is configured as payload data being encoded to the FEC code word of system code.

10. a kind of sending method, particularly for poor throughput network, described sender method includes:

Payload data is encoded to the FEC code word for being respectively provided with predetermined code word length,

Form the frame with predetermined frame length, wherein by by the weight of the predetermined quantity of FEC code word and the FEC code word The first frame part of frame is covered again and by the way that the position of the selected quantity of the FEC code word is covered the second of the frame Frame part, frame include have the first predetermined length of the integral multiple of the predetermined code word length the first frame part and Second frame part of the second predetermined length with the shorter than described predetermined code word length.

11. a kind of reception device, particularly for poor throughput network, the reception device includes:

Frame extraction unit is configured as extracting one or more frames from received transport stream, frame include be encoded to be respectively provided with it is pre- Determine the payload data of the FEC code word of codeword length, and frame has predetermined frame length, wherein frame includes having institute The first frame part of the first predetermined length of the integral multiple of predetermined code word length is stated, and there is the shorter than predetermined code word Second frame part of the second predetermined length of length, wherein the frame extraction unit is configured as from the first frame part of frame The repetition of the middle predetermined quantity for extracting FEC code word and the FEC code word, and from second frame part of the frame The position of the selected quantity of the FEC code word is extracted, and

Fec decoder device, be configured as the FEC code word extracted from the frame, the repetition of the FEC code word with And the position decoding payload data of the selected quantity of the FEC code word.

12. a kind of method of reseptance, particularly for poor throughput network, the method for reseptance includes:

One or more frames are extracted from received transport stream, frame includes being encoded to the FEC for being respectively provided with predetermined code word length The payload data of code word, and frame has predetermined frame length, wherein by extracting FEC from the first frame part of frame The repetition of the predetermined quantity of code word and the FEC code word and by from the second frame part of the frame extract described in The position of the selected quantity of FEC code word, frame include first predetermined length with the integral multiple of the predetermined code word length The first frame part and second frame part of the second predetermined length with the shorter than described predetermined code word length, with And

The repetition of the FEC code word, the FEC code word extracted from the frame and the FEC code word The position decoding payload data of selected quantity.

13. a kind of non-transitory computer readable recording medium, wherein computer program product is stored with, when the computer journey Sequence product makes to execute method described in 0 or 12 according to claim 1 when being executed as processor.